Jackson will miss remainder of 49ers training camp to rehab knee

SANTA CLARA — The 49ers might need to consider adding to their defensive front with Drake Jackson's future uncertain. Kyle Shanahan gave a less-than-positive update on the defensive end's status on Monday after the third-year pass rusher underwent patellar tendon surgery in January. "We don't have a timeline, I know it won't be any time in camp," Shanahan said. "We got to see how the rehab continues to go, but definitely not any time in camp." The 2022 second-round draft pick appeared in 15 games during his rookie season, registering three quarterback sacks while on the field for 315 total defensive plays or 33 percent of snaps. Jackson started out his second season with a bang, registering three quarterback sacks in the 49ers' Week 1 win over the Pittsburgh Steelers, but only was on the team's active game day roster for eight total contests before being shut down for the season in Week 9. "Any time you do that type of surgery that he had, those are big surgeries," Shanahan said. "They are tough to come back from and you never know how you're going to react. We always know it's a possibility it will take a long time, and it's taking a long time." The two notable defensive ends...